<h1><code ng:non-bindable="">ngRepeat</code>
<span class="hint">(directive in module <code ng:non-bindable="">ng</code>
)</span>
</h1>
<div><a href="http://github.com/angular/angular.js/edit/master/src/ng/directive/ngRepeat.js" class="improve-docs btn btn-primary">Improve this doc</a><h2 id="Description">Description</h2>
<div class="description"><p>The <code>ngRepeat</code> directive instantiates a template once per item from a collection. Each template
instance gets its own scope, where the given loop variable is set to the current collection item,
and <code>$index</code> is set to the item index or key.</p>

<p>Special properties are exposed on the local scope of each template instance, including:</p>

<ul>
<li><code>$index</code> – <code>{number}</code> – iterator offset of the repeated element (0..length-1)</li>
<li><code>$first</code> – <code>{boolean}</code> – true if the repeated element is first in the iterator.</li>
<li><code>$middle</code> – <code>{boolean}</code> – true if the repeated element is between the first and last in the iterator.</li>
<li><code>$last</code> – <code>{boolean}</code> – true if the repeated element is last in the iterator.</li>
</ul>

<p>Additionally, you can also provide animations via the ngAnimate attribute to animate the <strong>enter</strong>,
<strong>leave</strong> and <strong>move</strong> effects.</p></div>
<h2 id="Usage">Usage</h2>
<div class="usage">as attribute<pre class="prettyprint linenums">&lt;ANY ng-repeat="{repeat_expression}"&gt;
   ...
&lt;/ANY&gt;</pre>
as class<pre class="prettyprint linenums">&lt;ANY class="ng-repeat: {repeat_expression};"&gt;
   ...
&lt;/ANY&gt;</pre>
with <span id="animations">animations</span><pre class="prettyprint linenums">//The enter, leave and move animations are supported
&lt;ANY ng-repeat="{repeat_expression}" ng-animate="{enter: 'enter-animation', leave: 'leave-animation', move: 'move-animation'}"&gt;
   ...
&lt;/ANY&gt;</pre>
<a href="api/ng.$animator#Methods">Click here</a> to learn more about the steps involved in the animation.<h3 id="Directive.info">Directive info</h3>
<div class="directive-info"><ul><li>This directive creates new scope.</li>
<li>This directive executes at priority level 1000.</li>
</ul>
</div>
<h4 id="parameters">Parameters</h4><table class="variables-matrix table table-bordered table-striped"><thead><tr><th>Param</th><th>Type</th><th>Details</th></tr></thead><tbody><tr><td>ngRepeat</td><td><a href="" class="label type-hint type-hint-repeat_expression">repeat_expression</a></td><td><p>The expression indicating how to enumerate a collection. These
formats are currently supported:</p>

<ul>
<li><p><code>variable in expression</code> – where variable is the user defined loop variable and <code>expression</code>
is a scope expression giving the collection to enumerate.</p>

<p>For example: <code>track in cd.tracks</code>.</p></li>
<li><p><code>(key, value) in expression</code> – where <code>key</code> and <code>value</code> can be any user defined identifiers,
and <code>expression</code> is the scope expression giving the collection to enumerate.</p>

<p>For example: <code>(name, age) in {'adam':10, 'amalie':12}</code>.</p></li>
<li><p><code>variable in expression track by tracking_expression</code> – You can also provide an optional tracking function
which can be used to associate the objects in the collection with the DOM elements. If no tractking function
is specified the ng-repeat associates elements by identity in the collection. It is an error to have
more then one tractking function to  resolve to the same key. (This would mean that two distinct objects are
mapped to the same DOM element, which is not possible.)</p>

<p>For example: <code>item in items</code> is equivalent to `item in items track by $id(item)'. This implies that the DOM elements
will be associated by item identity in the array.</p>

<p>For example: <code>item in items track by $id(item)</code>. A built in <code>$id()</code> function can be used to assign a unique
<code>$$hashKey</code> property to each item in the array. This property is then used as a key to associated DOM elements
with the corresponding item in the array by identity. Moving the same object in array would move the DOM
element in the same way ian the DOM.</p>

<p>For example: <code>item in items track by item.id</code> Is a typical pattern when the items come from the database. In this
case the object identity does not matter. Two objects are considered equivalent as long as their <code>id</code>
property is same.</p></li>
</ul></td></tr></tbody></table><h3 id="Animations">Animations</h3>
<div class="animations"><ul><li>enter - when a new item is added to the list or when an item is revealed after a filter</li><li>leave - when an item is removed from the list or when an item is filtered out</li><li>move - when an adjacent item is filtered out causing a reorder or when the item contents are reordered</li></ul></div>
</div>
<h2 id="Example">Example</h2>
<div class="example"><p>This example initializes the scope to a list of names and
then uses <code>ngRepeat</code> to display every person:
  <h4>Source</h2>
<div source-edit="" source-edit-deps="angular.js" source-edit-html="index.html-175" source-edit-css="animations.css" source-edit-js="" source-edit-unit="" source-edit-scenario="scenario.js-176"></div>
<div class="tabbable"><div class="tab-pane" title="index.html">
<pre class="prettyprint linenums" ng-set-text="index.html-175" ng-html-wrap=" angular.js"></pre>
<script type="text/ng-template" id="index.html-175">
      <div ng-init="friends = [
        {name:'John', age:25, gender:'boy'},
        {name:'Jessie', age:30, gender:'girl'},
        {name:'Johanna', age:28, gender:'girl'},
        {name:'Joy', age:15, gender:'girl'},
        {name:'Mary', age:28, gender:'girl'},
        {name:'Peter', age:95, gender:'boy'},
        {name:'Sebastian', age:50, gender:'boy'},
        {name:'Erika', age:27, gender:'girl'},
        {name:'Patrick', age:40, gender:'boy'},
        {name:'Samantha', age:60, gender:'girl'}
      ]">
        I have {{friends.length}} friends. They are:
        <input type="search" ng-model="q" placeholder="filter friends..." />
        <ul>
          <li ng-repeat="friend in friends | filter:q"
              ng-animate="{enter: 'example-repeat-enter',
                          leave: 'example-repeat-leave',
                          move: 'example-repeat-move'}">
            [{{$index + 1}}] {{friend.name}} who is {{friend.age}} years old.
          </li>
        </ul>
      </div>
    </script>
</div>
<div class="tab-pane" title="animations.css">
<pre class="prettyprint linenums" ng-set-text="animations.css"></pre>
<style type="text/css" id="animations.css">
      .example-repeat-enter,
      .example-repeat-leave,
      .example-repeat-move {
        -webkit-transition:all linear 0.5s;
        -moz-transition:all linear 0.5s;
        -ms-transition:all linear 0.5s;
        -o-transition:all linear 0.5s;
        transition:all linear 0.5s;
      }

      .example-repeat-enter {
        line-height:0;
        opacity:0;
      }
      .example-repeat-enter.example-repeat-enter-active {
        line-height:20px;
        opacity:1;
      }

      .example-repeat-leave {
        opacity:1;
        line-height:20px;
      }
      .example-repeat-leave.example-repeat-leave-active {
        opacity:0;
        line-height:0;
      }

      .example-repeat-move { }
      .example-repeat-move.example-repeat-move-active { }
    </style>
</div>
<div class="tab-pane" title="End to end test">
<pre class="prettyprint linenums" ng-set-text="scenario.js-176"></pre>
<script type="text/ng-template" id="scenario.js-176">
       it('should render initial data set', function() {
         var r = using('.doc-example-live').repeater('ul li');
         expect(r.count()).toBe(10);
         expect(r.row(0)).toEqual(["1","John","25"]);
         expect(r.row(1)).toEqual(["2","Jessie","30"]);
         expect(r.row(9)).toEqual(["10","Samantha","60"]);
         expect(binding('friends.length')).toBe("10");
       });

       it('should update repeater when filter predicate changes', function() {
         var r = using('.doc-example-live').repeater('ul li');
         expect(r.count()).toBe(10);

         input('q').enter('ma');

         expect(r.count()).toBe(2);
         expect(r.row(0)).toEqual(["1","Mary","28"]);
         expect(r.row(1)).toEqual(["2","Samantha","60"]);
       });
      </script>
</div>
</div><div class="pull-right"> <button class="btn btn-primary" ng-click="animationsOff=true" ng-hide="animationsOff">Animations on</button> <button class="btn btn-primary disabled" ng-click="animationsOff=false" ng-show="animationsOff">Animations off</button></div><h2>Demo</h4>
<div class="well doc-example-live animator-container" ng-class="{'animations-off':animationsOff == true}" ng-embed-app="" ng-set-html="index.html-175" ng-eval-javascript=""></div></div>
</div>
